New license & forcing to download

Force downloads

The method sendDownload has now a second (optional) parameter, which forces the browser to download the file instead of using plugins to display the file directly (for example download the PDF file instead of displaying it with the Adobe Reader plugin directly in the browser).

Thanks @badgio

New license: BSD-3

I switched to BSD-3 instead of MIT. You basically still can use the library for everything you want (as specified by the license). 😎